BaseCamp Road Adult Cycling Bicycle Bike Safety Helmet Unisex Fit 56cm - 62cm with Visor LIGHTWEIGHT IMPACT RESISTANCE: The Basecamp mens bicycle helmet with poly-carbonate protective shell and tough and durable PC material. EPS foam which help slow down the impact and protect the head during crash. ADJUSTABLE HEAD CIRCUNFERENCE : Head Circumference 20"-22.8"/50-58CM. The road bike helmet goes with a standard size, equipped with a regulator and side straps make the cycling helmet suitable to different head size. If the size is still small for you, there are also two holes inside for attaching to adjust the size. DETACHABLE VISOR DESIGN : The visor of the bike helmet is removable.You can enjoy biking in hot days, and take off the visor blocks when you don't want it. VENTILATION 28-HOLE: Streamlined design, the adoption of specialized aerodynamic and ventilation design allow air go through the biking helmet which help increase the speed and keep stay cool and comfortable. GREAT AFTER-SALES SERVICE:If the helmet you received is broken or damaged, please contact us with pictures, after confirming it, we will refund in 24 hours and you may keep the item without returning.Any further problems about anything, please feel free to contact us. Imported EPS foam can minimize the impact of the damage. With high-grade imported PC material, the color will not fade. Ventilation design with 28 air vents. Ergonomic design makes the helmet more comfortable to wear. High elastic foam and healthy mesh ensure riding more comfortable. Easy to wash with disassembly function. Head Circumference : 20&#034;-22.8&#034;/50-58CM With Detachable Sun-visor : Yes Removable Lining : Yes Ventilation : Adjustable Certifications : CE